Improvement in grates for steam-generator and other furnaces



B. T. ,BABBlTI I Furnace Grate. No. 91,999. i Patented June 29.1899.

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BENJAMINrartrr, or NEW YORK, N. Y.

Leners Patent No. 91,999, auml .mme 29, 1869.

The Schedule referred to in these Letters Patent and making part of thesame.

To all whom itmay concern Be it known that I, BENJAMIN TQBABBITT, of thevcit-y, county,and State of New York, have invented a new and usefulImprovement in Fire-Grates, and that the Vfollowing is a full, clear,and exact description ofthe same, reference being had to theaccompanying drawing, forming part of this specilication, in Which- YFigure 1 represents a' plan of a nre-grate, constructed in accordancewith my improvement.

Figure 2, a section of the same, throilgh the line :c a: in tig. l, and

Figure 3 a'sectiou through the line z z.

Figure 4 is a plan ot' a grate, in part, constructed in accordance withthe invention, with the circulating pipes shown in previousfiguresomitted. i

Similar letters of reference indicate corresponding parts. Y v

My invention consists in a novel construction of tubular grate, for the.circulation or passage ot water through it, whereby not only is a largewater-heating surface secured, and the grate, by being kept cool,restrained from burning out, but its durability enhanced against injuryor brealflage by expansion and contraction ot' its parts, and thestructure, 'to secure these advantages, may beV got up cheap.

Said grate is more particularly designed for use in steam-boilerfurnaces, but is applicable to other fireplaces, and more especiallywherever a supply of' heatl ed water is required. Itwill sulhce here,however,

todescribethe invention as a water-grate for steamboiler furnaces.

Refer-ling to the accompanyingr drawing, the grate proper,as made up ofan intermediate or central hollow bar, A, and hollow branch bars, B, isor inay be made oia single casting.

' The branch-bars B are arranged to project-at right angles from 4thecentral bar, on either side ot' it, and.

disposed `to lie parallel toeach other, :1t-suitable distances apart,said branch-bars being in open communication at their inner ends withthe main bar, but ciosed at their outer ends, as shown in iig. 4,excepting where circulating-pipes are used in addition, as will behereinafter explained.

` The passage or circulation of' water through-the grate is vestablishedby introducing it under pressure, as for instance, by the action of apunip, into the one end ofthe main bar A, as by a pipe, C, arrangedbelow the grate, and after circulating through the branch-bars B,allowing it to escape, 'as by an outlet, D, and. connecting-pipe, fromthe opposite end of the main bar into the boiler or other place ofdischarge. A A grate thus constructed may be rgot up clleap, and

presents an extensive water-heating surface, which not only isproductive of economy as regards feed of previously-heated water to theboiler, but also as regards the durability of the grate by the coolingprovision whichis made throughout the whole body of the structure' Butan im poltant characteristic of this grate is the freedom forindependent expansion and contraction, in direction of their length, ofthe several bars of which the grate is composed, by reason of said bal'sbeing let't free or disconnected ti'oin each other at their outer ends,whereby all tendency to injury or breakage, from irregularity ofexpansion and contraction, is

avoided.

To enlarge or promotethe free circulation otwater through the gratewithout injuriously or seriously at'- tecting this characteristic of itsconstruction I connect any or all of' the lu'anch-bars, B, at their'outer ends, with the supply-pipe C, bybent wroughtfiron, copper, orother suitable and comparatively flexible tubes, a, which, while servingto produce circulation, do not inipede, 'to any practical extent, theindependent expansion and contraction of the several bars that are stilldisconnected from each other at their outer ends.

1What is here claimed, and desired to be secured by Letters Patent,VVis- 1. The construct-ion ot' the grate, consisting of' the hollow mainbar A, provided with suitahle'inlet andoutlet-passages forestablishing'iiow of water through the grate and hollow side orbrauch-bars, B, left free or disconnected from each other at their outerends, and in conununication with the main, bar at their inner ones,substantially as specified.-

2. lhe combination, with the hollow main and branch-bars A and B,constructed and arranged-substantially as specified, of' the bent tubesa, made of more flexible metal than the bars, substantially 'asSpecified' n 'T BABBITT NitnrA "s Y ll an. HAYNES, J. W. GooMBs.

